You have some nice looking fish. What is the ratio of your Burundi colony? It appears that you might be a little male heavy.
Your mpimbwe look great. Are they wilds? If you are looking to spawn them, it's usually best to have more than one female. That will keep the male from being to aggressive towards just one female. It also doubles your chances of having a successful spawn.

__________________The greater danger for most of us is not that our aim is too high and we miss it, but that it is too low and we reach it......Michealangelo